Identification_Information:

 Citation:

 Citation_Information:

 Originator: Rossman P. Irwin, III, Smithsonian Institution, 

National Air and Space Museum, Geologist

 Publication_Date: 20131216

 Title: Geologic Map of MTM -15027, -20027, -25027, and -25032 

Quadrangles, Margaritifer Terra Region of Mars

 Edition: 1

 Geospatial_Data_Presentation_Form: vector digital data

 Series_Information:

 Series_Name: Scientific Investigations Map

 Issue_Identification: 3209

 Description:

 Abstract: Mars Transverse Mercator (MTM) quadrangles -15027, -20027, 

-25027, and -25032 (lat 12.5-28 S., long 330-335 E. and lat 22.5-28 S., 

long 324.5-330 E.) in southwestern Margaritifer Terra include diverse 

erosional landforms, sedimentary deposits, and tectonic structures that 

record a long geologic and geomorphic history. The northeastern regional 

slope of the pre-Noachian crustal dichotomy (as expressed along the 

Chryse trough) and structures of the informally named Middle Noachian or 

older Holden and Ladon impact basins dominate the topography of the map 

area. A series of mesoscale outflow channels, Uzboi, Ladon, and Morava 

Valles, integrated these formerly enclosed basins by overflow and 

incision around the Noachian/Hesperian transition, although some flooding 

may have occurred earlier. The area includes excellent examples of Late 

Noachian to Hesperian valley networks, dissected crater rims, alluvial 

fans, deltas, and light-toned layered deposits (LTLDs), particularly in

Holden and Eberswalde craters. Structural forms include Tharsis-radial 

grabens, Hesperian wrinkle ridges, floor-fractured impact craters, and 

severely disrupted chaotic terrains. These well-preserved landforms and 

sedimentary deposits represent multiple erosional epochs and discrete 

flooding events, which provide significant insight into the geomorphic 

processes and climate change on early Mars.

 Purpose: Investigation of fluvial landforms and other surface 

modifications in a map area containing two high-priority rover landing 

sites.

 Time_Period_of_Content:

 Time_Period_Information:

 Range_of_Dates/Times:

 Beginning_Date: 20100601

 Ending_Date: 20131216

 Currentness_Reference: Bounds are in a positive East longitude 

system.

 Status:

 Progress: Complete

 Maintenance_and_Update_Frequency: None planned

 Spatial_Domain:

 Bounding_Coordinates:

 West_Bounding_Coordinate: -39.042431

 East_Bounding_Coordinate: -19.980428

 North_Bounding_Coordinate: -9.999991

 South_Bounding_Coordinate: -30.213008

 Keywords:
 Theme:

 Theme_Keyword_Thesaurus: NASA Glossary

 Theme_Keyword: Geologic, Mars, structure, Noachian, Hesperian, 

Amazonian, photogeologic, mapping

 Place:

 Place_Keyword_Thesaurus: Gazetteer of Planetary Nomenclature

 Place_Keyword: Mars, Margaritifer Terra, Holden, Ladon, Eberswalde

 Temporal:

 Temporal_Keyword_Thesaurus: None

 Temporal_Keyword: Noachian, Hesperian, Amazonian

 Access_Constraints: None

 Use_Constraints: None

 Point_of_Contact:

 Contact_Information:

 Contact_Organization_Primary:

 Contact_Organization: Smithsonian Institution, National Air and 

Space Museum

 Contact_Person: Rossman P. Irwin, III

 Contact_Position: Geologist

 Contact_Address:

 Address_Type: mailing and physical

 Address: MRC 315, Independence Ave at 6th St, SW

 City: Washington

 State_or_Province: DC

 Postal_Code: 20560

 Country: US

 Contact_Voice_Telephone: 202-633-3632

 Contact_Electronic_Mail_Address: irwinr@si.edu

 Point_of_Contact:

 Contact_Information:

 Contact_Organization_Primary:

 Contact_Organization: Smithsonian Institution, National Air and 

Space Museum

 Contact_Person: John A. Grant

 Contact_Position: Geologist

 Contact_Address:

 Address_Type: mailing and physical

 Address: MRC 315, Independence Ave at 6th St, SW

 City: Washington

 State_or_Province: DC

 Postal_Code: 20560

 Country: US

 Contact_Voice_Telephone: 202-633-2474

 Contact_Electronic_Mail_Address: grantj@si.edu

 Data_Set_Credit: Irwin, Rossman P., III, and John A. Grant, 2013, 

Geologic Map of MTM -15027, -20027, -25027, and -25032 Quadrangles, 

Margaritifer Terra Region of Mars, U.S. Geological Survey Scientific 

Investigations Map 3209, scale 1:1,000,000. Available at 

http://pubs.usgs.gov/sim/3209/

 Security_Information:

 Security_Classification_System: None

 Security_Classification: Unclassified

 Security_Handling_Description: N/A

 Native_Data_Set_Environment: Esri ArcGIS 9.3
Data_Quality_Information:

 Attribute_Accuracy:

 Attribute_Accuracy_Report: All attributes were verified by displaying 

the lines in both the database and the spatial coverage and they are 

believed to be logically consistent.

 Logical_Consistency_Report: Data is good to 1:1M scale. The base map 

used for mapping was 231 meters per pixel.

 Completeness_Report: These data are believed to be logically 

consistent. Line geometry is topologically clean.

 Lineage:

 Process_Step:

 Process_Description:

 Detailed mapping was based on THEMIS visible images at 18 m/pixel 

and Mars Reconnaissance Orbiter (MRO) Context Camera images at 5 m/pixel. 

Where available, Mars Orbiter Camera (MOC) images at ~2-5 m/pixel, MRO 

High Resolution Imaging Science Experiment (HiRISE) visible images at 25 

cm/pixel, and Compact Reconnaissance Imaging Spectrometer for Mars 

(CRISM) products facilitated local interpretations of within-unit 2 

stratigraphy. Topographic measurements were based on the 128 pixel/degree 

MOLA Mission Experiment Gridded Data Record. Using ArcGIS 9.3, we drafted 

line work at 1:250,000 scale for publication at 1:1,000,000 scale. 

 Unit contacts have a stream-digitized vertex spacing of ~500 m 

and are attributed as definite or approximate. Linear features include 

faults, crater rims, and small valleys.

 Process_Date: 20100701

 Process_Contact:

 Contact_Information:

 Contact_Organization_Primary:

 Contact_Organization: Smithsonian Institution, National Air 

and Space Museum

 Contact_Person: Rossman P. Irwin, III

 Contact_Position: Geologist

 Contact_Address:

 Address_Type: mailing and physical

 Address: MRC 315, Independence Ave at 6th St, SW

 City: Washington

 State_or_Province: DC

 Postal_Code: 20560

 Country: US

 Contact_Voice_Telephone: 202-633-3632

 Contact_Electronic_Mail_Address: irwinr@si.edu

Spatial_Data_Organization_Information:

 Direct_Spatial_Reference_Method: Vector

 Point_and_Vector_Object_Information:

 SDTS_Terms_Description:

 SDTS_Point_and_Vector_Object_Type: Entity point

 Point_and_Vector_Object_Count: 46

 SDTS_Terms_Description:

 SDTS_Point_and_Vector_Object_Type: String

 Point_and_Vector_Object_Count: 629

 SDTS_Terms_Description:

 SDTS_Point_and_Vector_Object_Type: Entity point

 Point_and_Vector_Object_Count: 163
 SDTS_Terms_Description:

 SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains

 Point_and_Vector_Object_Count: 160

 SDTS_Terms_Description:

 SDTS_Point_and_Vector_Object_Type: String

 Point_and_Vector_Object_Count: 4

 SDTS_Terms_Description:

 SDTS_Point_and_Vector_Object_Type: String

 Point_and_Vector_Object_Count: 1829

Spatial_Reference_Information:

 Horizontal_Coordinate_System_Definition:

 Planar:

 Map_Projection:

 Map_Projection_Name: Mars Holden

 Transverse_Mercator:

 Scale_Factor_at_Central_Meridian: 1.0

 Longitude_of_Central_Meridian: -30.0

 Latitude_of_Projection_Origin: 0.0

 False_Easting: 0.0

 False_Northing: 0.0

 Planar_Coordinate_Information:

 Planar_Coordinate_Encoding_Method: coordinate pair

 Coordinate_Representation:

 Abscissa_Resolution: 0.0001

 Ordinate_Resolution: 0.0001

 Planar_Distance_Units: meter

 Geodetic_Model:

 Horizontal_Datum_Name: D Mars 2000

 Ellipsoid_Name: Mars 2000 IAU IAG

 Semi-major_Axis: 3396190.0

 Denominator_of_Flattening_Ratio: 169.8944472236118

Distribution_Information:

 Distributor:

 Contact_Information:

 Contact_Organization_Primary:

 Contact_Organization: U. S. Geological Survey

 Contact_Person: USGS Publications

 Contact_Address:

 Address_Type: mailing

 Address: Box 25286, Federal Center

 City: Denver

 State_or_Province: CO

 Postal_Code: 80225-0046

 Country: US

 Contact_Voice_Telephone: 1-888-ASK-USGS

 Contact_Electronic_Mail_Address: usgsstore@usgs.gov

 Distribution_Liability: None

 Standard_Order_Process:

 Digital_Form:

 Digital_Transfer_Option:

 Online_Option:

 Computer_Contact_Information:

 Network_Address:

 Network_Resource_Name: http://pubs.usgs.gov/sim/3209/
 Ordering_Instructions: Download digital map

 Available_Time_Period:

 Time_Period_Information:

 Single_Date/Time:

 Calendar_Date: 20131216

Metadata_Reference_Information:

 Metadata_Date: 20131213

 Metadata_Contact:

 Contact_Information:

 Contact_Organization_Primary:

 Contact_Organization: USGS

 Contact_Person: Trent Hare

 Contact_Position: Cartographer

 Contact_Address:

 Address_Type: mailing and physical

 Address: 2255 North Gemini Drive

 City: Flagstaff

 State_or_Province: AZ

 Postal_Code: 86001

 Country: US

 Contact_Voice_Telephone: 928-556-7100

 Contact_Electronic_Mail_Address: thare@usgs.gov

 Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial 

Metadata

 Metadata_Standard_Version: FGDC-STD-001-1998

 Metadata_Time_Convention: local time

 Metadata_Use_Constraints: None